Trans-border (east Serbia/west Bulgaria) correlation of the Jurassic sediments: Main Jurassic paleogeographic units

Abstract

In the region across the Serbian/Bulgarian state border, there are individualized 5 Jurassic paleogeographic units (from West to East): (1) the Thracian Massif Unit without Jurassic sediments; (2) the Luznica-Koniavo Unit - partially with Liassic in Grsten facies and with deep water Middle Callovian-Kimmeridgian (p. p) sediments of the type "ammonitico rosso", and Upper Kimmeridgian-Tithonian siliciclastics flysch; (3) The Getic Unit subdivided into two subunits - the Western Getic Sub-Uni - without Lower Jurassic sediments and the Eastern Getic Sub-Unit with Lower Jurassic continental and marine sediments, which are followed in both sub-units by carbonate platform limestones (type Stramberk); (4) the Infra (Sub)-Getic Unit - with relatively deep water Liassic and Dogger sediments (the Dogger of type "black shales with Bossitra alpine") and Middle Callovian-Tithonian of type "ammonitico rosso"; (5) the Danubian Unit - with shallow water Liassic, Dogger and Malm (Miroc-Vrska Cuka Zone, deep water Dogger and Malm (Donjomilanovacko-Novokoritska Zone).U podrucju srpsko-bugarske drzavne granice izdvojeno je pet jurskih paleogeografskih jedinica (od zapada ka istoku): 1. Trakijski masiv bez jurskih sedimenata; 2. Luznica-Koniavo - delimicno sa lijasom razvijenim u grestenskoj faciji i sa dubokovodnim sedimentima srednjeg kaloveja-kimeridza (p. p) tipa "ammonitico rosso" i silikoklasticnim flisom gornjeg kimeridza-titona; 3. Getikum, podeljen na Zapadnogetsku podjedinicu bez donjojurskih sedimenata i Istocnogetsku podjedinicu sa donjojurskim kontinentalnim i marinskim sedimentima posle kojih u obe podjedinice slede krecnjaci karbonatske platforme (tipa Stramberk); 4. Infra(sub)getikum sa relativno dubokovodnim sedimentima lijasa i dogera (doger tipa "crnih glinaca sa Bossitra alpina") i srednjeg kaloveja-titona (tipa "ammonitico rosso"); 5. Danubijska jedinica sa plitkovodnim lijasom, dogerom i malmom (zona Miroc-Vrska Cuka), dubokovodnim dogerom i malmom (Donjomilanovacka-novokoritska zona).